131642506154 has 4 divisors (see below), whose sum is σ = 197463759234. Its totient is φ = 65821253076.

The previous prime is 131642506147. The next prime is 131642506157. The reversal of 131642506154 is 451605246131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 451605246131 = 13 ⋅34738865087.

It can be written as a sum of positive squares in only one way, i.e., 103191925225 + 28450580929 = 321235^2 + 168673^2 .

It is not an unprimeable number, because it can be changed into a prime (131642506157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32910626537 + ... + 32910626540.

Almost surely, 2^131642506154 is an apocalyptic number.

131642506154 is a deficient number, since it is larger than the sum of its proper divisors (65821253080).

131642506154 is an equidigital number, since it uses as much as digits as its factorization.

131642506154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65821253079.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 131642506154 in words is "one hundred thirty-one billion, six hundred forty-two million, five hundred six thousand, one hundred fifty-four".